code: def _get_eikonal_loss(grad_theta):
      return ((grad_theta.norm(2, dim=1) - 1) ** 2).mean()
  
imports: import warnings
  from typing import Any, Dict, Optional
  import torch
  from pytorch3d.implicitron.models.renderer.ray_sampler import ImplicitronRayBundle
  from pytorch3d.implicitron.tools import metric_utils
  from pytorch3d.implicitron.tools.config import registry, ReplaceableBase
  from pytorch3d.ops import padded_to_packed
  from pytorch3d.renderer import utils
  from .renderer.base import RendererOutput
label_desc: Use image node_id 2 for calling a global function with example usage: _get_eikonal_loss(grad_theta) and returns: unknown